com.cedarsoft.gdao.hibernate.HibernateDao Maven / Gradle / Ivy
/**
* Copyright (C) cedarsoft GmbH.
*
* Licensed under the GNU General Public License version 3 (the "License")
* with Classpath Exception; you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.cedarsoft.org/gpl3ce
* (GPL 3 with Classpath Exception)
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 3 only, as
* published by the Free Software Foundation. cedarsoft GmbH designates this
* particular file as subject to the "Classpath" exception as provided
* by cedarsoft GmbH in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 3 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 3 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact cedarsoft GmbH, 72810 Gomaringen, Germany,
* or visit www.cedarsoft.com if you need additional information or
* have any questions.
*/
package com.cedarsoft.gdao.hibernate;
import com.cedarsoft.NullLock;
import com.cedarsoft.gdao.Finder;
import com.cedarsoft.gdao.GenericDao;
import com.cedarsoft.gdao.LockProvider;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.springframework.dao.DataAccessException;
import org.springframework.dao.EmptyResultDataAccessException;
import org.springframework.orm.hibernate3.HibernateCallback;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;
import java.lang.Override;
import java.util.List;
import java.util.concurrent.locks.Lock;
/**
* Hibernate implementation for {@link GenericDao}.
* This class is *not* thread safe
*
* @param the type
*/
public class HibernateDao extends HibernateDaoSupport implements GenericDao {
@NonNls
@NotNull
private static final Log log = LogFactory.getLog( HibernateDao.class );
@NotNull
private final Class type;
@Nullable
private final LockProvider lockProvider;
/**
* Creates a new instance
*
* @param sessionFactory the session factory
* @param type the type
*/
public HibernateDao( @NotNull SessionFactory sessionFactory, @NotNull Class type ) {
this( sessionFactory, type, null );
}
public HibernateDao( @NotNull SessionFactory sessionFactory, @NotNull Class type, @Nullable LockProvider lockProvider ) {
this.type = type;
this.lockProvider = lockProvider;
setSessionFactory( sessionFactory );
}
@Nullable
public LockProvider getLockProvider() {
return lockProvider;
}
@Override
public final void remove( @NotNull T element ) throws DataAccessException {
delete( element );
}
@Override
public final void add( @NotNull T element ) {
saveOrUpdate( element );
}
@Override
public void commit( @NotNull T element ) {
update( element );
}
@Override
public void setElements( @NotNull List elements ) {
throw new UnsupportedOperationException( "Not supported for daos" );
}
@Override
@NotNull
public final List getElements() {
return findAll();
}
@Override
@NotNull
public List findAll() {
return getHibernateTemplate().executeFind( new HibernateCallback() {
@Override
public Object doInHibernate( Session session ) throws HibernateException {
return session.createCriteria( type ).list();
}
} );
}
@Override
public int getCount() {
return ( Integer ) getHibernateTemplate().execute( new HibernateCallback() {
@Override
public Object doInHibernate( Session session ) throws HibernateException {
return session.createCriteria( type ).list().size();
}
} );
}
@Override
@NotNull
public Long save( @NotNull LT newInstance ) {
Lock writeLock = getWriteLock( newInstance );
writeLock.lock();
try {
return ( Long ) getHibernateTemplate().save( newInstance );
} finally {
writeLock.unlock();
}
}
/**
* Returns the write lock for the given object
*
* @param object the object the write lock is obtained for
* @return the write lock for the given object or a NULL lock
*/
@NotNull
private Lock getWriteLock( @NotNull T object ) {
if ( lockProvider != null ) {
return lockProvider.getWriteLock( object );
} else {
return NullLock.LOCK;
}
}
@Override
@NotNull
public T findById( @NotNull Long id ) throws DataAccessException {
T found = type.cast( getHibernateTemplate().get( type, id ) );
if ( found == null ) {
throw new EmptyResultDataAccessException( 1 );
}
return found;
}
@Override
public void saveOrUpdate( @NotNull LT object ) {
Lock lock = getWriteLock( object );
lock.lock();
try {
getHibernateTemplate().saveOrUpdate( object );
} finally {
lock.unlock();
}
}
@Override
public void update( @NotNull LT transientObject ) {
Lock lock = getWriteLock( transientObject );
lock.lock();
try {
getHibernateTemplate().saveOrUpdate( transientObject );
} finally {
lock.unlock();
}
}
@Override
public void delete( @NotNull LT persistentObject ) throws DataAccessException {
Lock lock = getWriteLock( persistentObject );
lock.lock();
try {
getHibernateTemplate().delete( persistentObject );
} catch ( DataAccessException e ) {
log.warn( "Error when trying to delete " + persistentObject );
throw e;
} finally {
lock.unlock();
}
}
@Override
@NotNull
public T find( @NotNull final Finder finder ) throws EmptyResultDataAccessException {
//noinspection unchecked
return ( T ) getHibernateTemplate().execute( new HibernateCallback() {
@Override
@NotNull
public T doInHibernate( @NotNull Session session ) throws HibernateException {
return finder.find( session );
}
} );
}
@Override
public void shutdown() {
}
@Override
public String toString() {
return "HibernateDao for: " + type.getName() + ". " + hashCode();
}
}